Merge pull request #260 from alibaba-damo-academy/tmp

zhifu gao

2023-03-17 41eb0b4b5e15df9ebf2c1308c8b3ae0c2ef4c845

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# -*- coding: utf-8 -*-
 
 
try:
    strtype = basestring
except NameError:
    strtype = str
 
 
def to_s(val):
    try:
        return unicode(val)
    except NameError:
        return str(val)